Automatic air-damper.



No. 866,515. PATENTED SEPT. 17, 1907.

A.'W. PUDDINGTON.

AUTOMATIC AIR DAMPER.

APPLICATION FILED JAN. 7. 1907 2 SHEETS-SHEET 1.

re: NORRIS PETERS co. WKSHINGTDN, a. c.

PATENTBD SEPT. 17, 1907.

A. W. PUDDINGTON.

AUTOMATIC AIR DAMPER.

APPLIGATION FILED JAN. 7. 1907.

2 SHEETS-SHEET 2.

rm: uo nms FETERS co., wnsumcmu a r EN OFFICE.

ARTHUR W. PUDDINGTON, OF CLEVELAND, OHIO.

AUTOMATIC AIR-DAMPER.

Specification of Letters Patent.

Patented Sept. 17, 1907.

Application filed January 7,1907. Serial No. 351,045.

To all whom it may concern:

Be it known that I, ARTHUR W. PUnmNo'roN, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Automatic Air-Dampers, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

The object of this invention is to provide in a very simple and ellicient form an automatically operated air damper.

The invention is well adapted for steam boiler furnaces having jets of steam or gas, such as are used for the prevention of smoke. In my apparatus, the damper is provided with means tending to close it, and theforce of the jet is arranged to open such damper and maintain it open as long as the jet lasts. By this means, whenever the steam or gas is injected, the proper quan tity of air is simultaneously and automaticallysupplied, such air being shut off when the jet is shut off, proper, and substantially complete combustion being thus secured The invention is hereinafter more fully explained and its essential characteristics set out in the claims.

In the drawings, Figure 1 is a vertical section through the front portion of a steam boiler furnace equipped with one form of my automatic air damper; Fig. 2 is a vertical section showing another form of such damper; Fig. 3 is a detail showing the damper actuator appearing in Fig. 2; Fig. 4 is a section of the mechanism of the damper shown in Fig. 1; Fig. 5 is a cross section of such damper on the line 5 of Fig. 4.

As shown in the drawings, the furnace is equipped with one or more air passage ways 10, which are occupied by nozzles 11 adapted to inject steam or gas from pipes 12. The nozzle is movable and controls the air damper, and the opening through the nozzle is small enough so that the pressure of the steam or gas injected through it will move it to an extreme position holding the damper open. When the force of the jet stops, certain constantly acting means, as a spring or weight, returns the damper to its normally closed position.

In the form shown in Figs. 1, 4 and 5, there are secured along the front of the furnace a series of casings 15, having reduced screw-threaded extensions 14 which are screwed into the pipes 16 which constitute a part of the air passage ways 10. The iron front 13 of the furnace may be clamped by the body of the casing and the pipe 16. The casing 15 preferably has a cylindrical form, through which are air openings in the form of poripheral segmental slots 17. Slidably engaging the inner surface of the peripheral wall is the damper ring 18, which is adapted to close the openings 17, or leave them open, according to its position. This damper ring 18 has extending inwardly spider arms 19, which terminate in a flat hub surrounding the sleeve 20,

a single circular line.

which is movably mounted on the steam or gas pipe 12, this sleeve being provided with a flange 21 against which the hub rests, and there being a clamping nut 22 screwing onto the sleeve and clamping the spider hub. The sleeve 20 carries the nozzle 11, which, as shown, is provided by a cap 24 screwing onto the end of the sleeve, a short tube 25 screwing into the cap, and a head 26 screwing onto this short tube and having a small exit orifice 29. The object of this construction is to provide a nozzle which restricts the passage way and which may be cheaply constructed and easily repaired. The casing 15 is provided with a cover 30 which is held thereto bybolts 31 passing through the cover and screwechinto-the casing. Surrounding these bolts are springs 32 bearing against the spider arms 19 and tending to force such spider outwardly. The normal position of the parts is that shown in Fig. 4. When, however, gas or steam is admitted into the pipe 12, the same passes in a jet through the nozzle into the furnace. At the same time, the force of this jet acting on the inner walls of cap 24 and head 26, force the nozzle inwardly, thus moving the spider and damper 18 against the action of the springs 32 and uncovering the air openings 17 The air thus rushes in from these openings and passes between the spider arms and out through the i11- ward extension 14 of the casing and through the pipe 16 into the furnace. As long as the jet continues to flow its force on the movable nozzle maintains the damper open. As soon as the jet stops, the springs 32 return the damper to normal position. The passage way provided around the nozzle and through the pipe 16 have substantially the same cross-sectional area as the openings 17. Surrounding the peripheral wall of the casing 15 I have shown a regulating ring 35 which may be positioned to restrict the openings 17 to any extent desired, thereby regulating the amount of air which is admitted. A set screw 36 serves to clamp this ring in position. The sleeve 20 is provided with an inward flange 27, which substantially engages the pipe 12, this flange providing a conical seat on its inner face. The inner end of the pipe 12 is flanged outwardly to cooperate with this seat, this outward flange 28 having its surface preferably a section of a sphere. The result of this is that contact between the two flanges when the nozzle is forced inwardly takes place along This contact is thus adapted to be steam or gas tight, the pressure of the steam or gas holding the surfaces in this position.

In Fig. 2 the damper designated 40 is shown as occupying an air flue 41 communicating with the passage way 10. This damper is normally maintained closed by a weight 43. It is opened by the movement of the nozzle 11 which operates a bell crank 45 connected by a link 46 with the damper. The bell crank is connected with the nozzle by engaging in a slot 47 in an ear on the under side of the nozzle member. The nozzle is slidably mounted on the steam or gas pipe and is adapted to make a tight connection therewith when in its extreme position. The operation of this embodiment is the same as that previously described. The air damper is normally closed, but when the steam or gas is injected the force thereof moves the nozzle inwardly, opening the air damper and maintaining it open until the injection ceases.

It Will be seen that my invention may be embodied in very simple construction in a variety of Ways. It results in the furnace being automatically supplied with the proper quantity of air Whenever the steam or gas is injected, the air being automatically shut off when the injection ceases.

I claim:

1. The combination with means for forming a fluid jet, of an air damper controlled by a part moved by the pressure of the fluid.

2. The combination of means for forming a fluid jet, said means having a part movable by the force of the fluid, and an air damper adapted to be opened by the movement of said part.

3. The combination of an air damper, means for con ducting a jet of steam or gas and including a member adapted to be moved by such fiuid, and means controlled by the movement of such member for actuating the damper.

4. The combination of a nozzle, means for conducting steam or gas thereto, one of said parts being movable by the pressure of such fluid, an air damper, and an operating mechanism between the air damper and such movable part.

5. The combination of a nozzle movable by fluid pressure and an air damper actuated thereby.

6. The combination with a furnace, of means for ad mitting a jet thereto, said means including a movable tubular part and an air damper openable by the movement of said part.

7. The combination with a furnace having an air passage Way thereto of a movable nozzle adapted to be moved by fluid pressure within it occupying such passage way, means for conducting air or gas to such nozzle and admitting the same in the form of a jet, and an air damper controlled by the force of such fluid acting to move said nozzle,

8. The combination with a furnace having an air passageway thereto, of an air damper controlling such passageway, a nozzle adapted to be moved by fluid pressure within it, means for conducting steam or gas to the nozzle, and an actuating mechanism connecting the nozzle and damper and adapted to be moved by the movement of the nozzle.

9. The combination of means for conducting fluid and delivering it in a jet and including a movable member, an air damper, and connecting mechanism between said movable member and air damper, whereby the air damper may be operated by the pressure of said fluid,

10. The combination of a pipe and a nozzle, one of them being movable and the two adapted to thereby telescope, said pipe and nozzle having flanges adapted to coact to limit the telescoping movement and forming a substantially tight connection between the nozzle and pipe, an air damper and mechanism connecting it with the movable one of such telescoping members.

11. The combination with a fluid conduit, a longitudinally movable nozzle carried thereby and adapted to be supplied with fluid from the conduit and be moved by the internal fluid pressure, an air damper, and connecting mechanism between the same and said nozzle.

12. The combination of a furnace, an air passageway thereto, an air damper for controlling such passageway, means occupying the passageway for discharging a fluid jet into the furnace, said means having a movable part forming a portion of the fluid conduit and connecting mechanism between said part and the air damper, whereby the air damper is positively operated when the fluid is injected.

In testimony whereof, I hereunto athx my signature in the presence of two witnesses.

ARTHUR W. PUDDINGTON.

Witnesses ALBERT Hv BATES, G. A. MYERS. 

